Stop-cock or valve.



No. 629,894. Patented Aug. I, I899.

H.'M. DUNLAP.

STOP-600K OR VALVE. (Application filed Sept. 26, was. {No Modql.)

M w G 1.

Witrgesses:

UNITED S ATES.

PATENT ()FFIcE.

HARLEY M. DUNLAP, OF BATTLE CREEK, MICHIGAN.

sToP-oocK o'R VALVE.

SPECIFICATION forming part of Letters Patent No. 629,894, dated August 1, 1899.;

Application filed September 26,1898. Serial No. 691,933. (No modelJ,

To all whom, it may concern:

Be it known that I, HARLEY M. DUNLAP, a

citizen of the United States, residing at the city of Battle Creek, in the county of Calhoun and State of Michigan, have invented certain new and useful Improvements in Stop-Cocks or Valves, of which the following is a specification. I

This invention relates to improvements in valve mechanism or stop-cocks for use in connection with medical instruments in which air-pressure or a current of air is employed for spraying purposes. This device is also adapted to other uses'as a stop-cock. As heretofore constructed these devices have relied on springs or complicated mechanism for manipulating the valve to open and close quickly, none of the said devices known to me being entirely. satisfactory owing to the fact that they easily get out of repair and when out of repair are mended again with great difficulty, and, again, those relying on pointed out in theclaims.

springs lack durability on'account of the inherent defect of all springs that they will wear out. 7

The objects of this invention are to provide a simple and efficient valve means or stop cock for the purposewhich shall be positive and quick in its action without the use of springs or any complicated mechanism. Other and further objects will appear from In the drawings similar letters of reference refer to similar parts throughout both views.

Referring to the lettered parts of the drawings, A is the valve-casing, having an inletpassa-ge I, where it receives compressed air or other gas or 'vapor from tube G,'which connects to the reservoir for the same. The passage I leads into a chamber 1, from which there is an opening leading out to a discharge-nipple O, which is adapted to insert into a tube or any instrument, as an atomizer, which it is desired to use in this connection. In case only an air-blast is used this nipple can be left bare or be omitted. I, A small valve D is seated in the passage just beyond the chamber 1' and closes against pressure. The stem D of this valve extends through the chamber I. The chamber I is prefer ably circular, and a diaphragm E is secured over one side of the same by a screw-cap B, which clamps the edges of the same air-tight. The stem D of the valve extends through the central part of the diaphragm'E, the projecting part being screw-threaded, on which is screwed the button F, which has a stem or shank which is hollow and screw-threaded to receive the valve-stem. When the parts are screwed together, they engage the diaphragm at its center by an air-tight joint.-

The diaphragm E ispreferablymade of rubber fabric, though leather could be employed in this position or even thin metal. The cap B might be extended and bored out like a cylinder, and the diaphragm E instead of being flexible might beadisk fitting air-tight into the extended portion, which would serve the same purpose, though of course it would be much more expensive to manufacture in this form. This is illus trated in Fig. 2. I v

I prefer to make the nozzle 0 separable from the main portions, though it might be integral by making suitablechanges in other parts. The removable nozzle is preferred. 7

Numerous other modifications are possible and will no doubt suggest themselves to those skilled in the art to which this inven- I one side of chamber If a valve D, with stem- D, closing toward said chamber I; a button F, with suitable shank clamping said valve- 7 receive the pressure and hold the valve 110E;

mally closed, and means as a button to apply pressure to the valve to open the same, the pressure of the fiuid causing the valve to close automatically for the purpose specified.

In Witness whereof I have hereunto set my hand and seal in the presence of two Wit-' nesses. y HARLEY M. DUNLAP. FL. s.] Witnesses:

FRED. WELLS, H. A. ROWLES; 

